Bug: utilitiescs-test-duplicate-percentageformattertests-compile-entry

[drmoisan]

• Work Mode: minor-audit

Summary

UtilitiesCS.Test/UtilitiesCS.Test.csproj lists OutlookObjects\Folder\PercentageFormatterTests.cs twice, producing MSBuild warning CS2002 ("Source file specified multiple times"). The duplicate is long-standing and unrelated to any single feature branch.

Environment

• OS/version: Windows 11 Pro 10.0.26200
• Runtime: .NET Framework 4.8.1, legacy non-SDK project (ToolsVersion="15.0", packages.config)
• Command/flags used: msbuild TaskMaster.sln /t:Build /p:Configuration=Debug /p:Platform="Any CPU" /p:EnableNETAnalyzers=true /p:EnforceCodeStyleInBuild=true
• Data source or fixture: UtilitiesCS.Test/UtilitiesCS.Test.csproj

Steps to Reproduce

1. From the repository root, run the analyzer build command above.
2. Search the build output for CS2002.
3. Inspect UtilitiesCS.Test/UtilitiesCS.Test.csproj and search for PercentageFormatterTests.cs.

Expected Behavior

Each source file appears exactly once in the project's <Compile Include> item group, and the build emits no CS2002 warning.

Actual Behavior

The file is included twice. Verified on 2026-08-08 on branch bug/quickfiler-search-keystroke-focus-steal-438:

304:    <Compile Include="OutlookObjects\Folder\PercentageFormatterTests.cs" />
356:    <Compile Include="OutlookObjects\Folder\PercentageFormatterTests.cs" />

The same duplicate is present at the merge-base commit 003c5715 (at lines 302 and 354 there), confirming it predates that branch.

Logs / Screenshots

• Attached minimal logs or screenshot
• Snippet: the two <Compile Include> lines above, from grep -n "PercentageFormatterTests" UtilitiesCS.Test/UtilitiesCS.Test.csproj.

Impact / Severity

• Blocker
• High
• Medium
• Low

The build succeeds and tests run, so there is no functional defect today. The cost is a persistent warning in every build of the solution, which erodes the signal value of build output. It also carries a latent risk: the repository's type-check stage runs with /p:TreatWarningsAsErrors=true, and any future change that promotes CS2002 to error severity would break that protected gate.

Source

From: docs/features/potential/2026-08-08-utilitiescs-test-duplicate-percentageformattertests-compile-entry.md

[drmoisan]

Duplicate of #394, which is open and tracks the same duplicate PercentageFormatterTests.cs compile entry. I filed this during orchestration of #438 before checking existing promotions; the fresh 2026-08-08 evidence has been added to #394 instead. Closing to keep a single tracking issue.